mirror of
https://github.com/matrix-construct/construct
synced 2024-07-04 09:38:37 +02:00
79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_BUFFER_FIXED_BUFFER_H
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/// fixed_buffer wraps an std::array with construction and conversions apropos
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/// the ircd::buffer suite. fixed_buffer should be punnable. Its only memory
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/// footprint is the array itself and
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///
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template<class buffer,
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size_t SIZE>
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struct ircd::buffer::fixed_buffer
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:std::array<typename std::remove_const<typename buffer::value_type>::type, SIZE>
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{
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using mutable_type = typename std::remove_const<typename buffer::value_type>::type;
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using const_type = typename std::add_const<mutable_type>::type;
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using array_type = std::array<mutable_type, SIZE>;
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operator buffer() const;
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operator buffer();
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using array_type::array_type;
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fixed_buffer(const nullptr_t &);
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fixed_buffer(const std::function<void (const mutable_buffer &)> &closure);
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fixed_buffer(buffer b);
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fixed_buffer() = default;
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};
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static_assert
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(
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// Assertion over an arbitrary but common template configuration.
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std::is_standard_layout<ircd::buffer::fixed_buffer<ircd::buffer::const_buffer, 32>>::value,
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"ircd::buffer::fixed_buffer must be standard layout"
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);
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template<class buffer,
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size_t SIZE>
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ircd::buffer::fixed_buffer<buffer, SIZE>::fixed_buffer(const nullptr_t &)
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:array_type{{0}}
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{}
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template<class buffer,
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size_t SIZE>
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ircd::buffer::fixed_buffer<buffer, SIZE>::fixed_buffer(const std::function<void (const mutable_buffer &)> &closure)
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{
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closure(mutable_buffer{reinterpret_cast<mutable_buffer::iterator>(this->data()), this->size()});
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}
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template<class buffer,
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size_t SIZE>
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ircd::buffer::fixed_buffer<buffer, SIZE>::fixed_buffer(buffer b)
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:array_type{std::begin(b), std::end(b)}
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{}
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template<class buffer,
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size_t SIZE>
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ircd::buffer::fixed_buffer<buffer, SIZE>::operator
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buffer()
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{
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return { std::begin(*this), std::end(*this) };
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}
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template<class buffer,
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size_t SIZE>
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ircd::buffer::fixed_buffer<buffer, SIZE>::operator
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buffer()
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const
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{
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return { std::begin(*this), std::end(*this) };
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}
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